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G.M. still stands behind its
pledge that the Volt will be able to travel at least 40 miles wi=
th no
exhaust emissions on a fully charged battery. The sole
propulsion source is a 160-horsepower alternating-current motor. The 1.4-li=
ter
gas engine runs only when necessary to power a generator, which in turn
supplies electrical current to both the battery pack and the drive motor.=
span>The concept had a turbocharged
3-cylinder; the production car will have a naturally aspirated 4-cylinder.E=
lectric
motors, generators and engines are old hat at G.M., in contrast to the
Volt’s lithium-ion battery pack, a leap into uncharted territory. The 400-pound T-shaped pack provides 16 kilowatt-hour=
s of
electricity (equivalent to 21 horsepower for one hour), =
and is nestled between and behind the seats.

Question: Show tha=
t 16 kwh
is equivalent approximately to 21 HP for one hour. In other words, show that
the same amount of joules(J) is provided no matter if the conversion is don=
e in
the metric mks system or the English system.Hint: 3600 s =3D 1 hour, 746 J =3D=
1 HP